2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
20 #include <linux/kvm.h>
21 #include <linux/module.h>
22 #include <linux/errno.h>
23 #include <asm/processor.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
28 #include <linux/miscdevice.h>
29 #include <linux/vmalloc.h>
30 #include <asm/uaccess.h>
31 #include <linux/reboot.h>
33 #include <linux/debugfs.h>
34 #include <linux/highmem.h>
35 #include <linux/file.h>
37 #include <linux/sysdev.h>
38 #include <linux/cpu.h>
39 #include <linux/file.h>
41 #include <linux/mount.h>
43 #include "x86_emulate.h"
44 #include "segment_descriptor.h"
46 MODULE_AUTHOR("Qumranet");
47 MODULE_LICENSE("GPL");
49 static DEFINE_SPINLOCK(kvm_lock
);
50 static LIST_HEAD(vm_list
);
52 struct kvm_arch_ops
*kvm_arch_ops
;
53 struct kvm_stat kvm_stat
;
54 EXPORT_SYMBOL_GPL(kvm_stat
);
56 static struct kvm_stats_debugfs_item
{
59 struct dentry
*dentry
;
60 } debugfs_entries
[] = {
61 { "pf_fixed", &kvm_stat
.pf_fixed
},
62 { "pf_guest", &kvm_stat
.pf_guest
},
63 { "tlb_flush", &kvm_stat
.tlb_flush
},
64 { "invlpg", &kvm_stat
.invlpg
},
65 { "exits", &kvm_stat
.exits
},
66 { "io_exits", &kvm_stat
.io_exits
},
67 { "mmio_exits", &kvm_stat
.mmio_exits
},
68 { "signal_exits", &kvm_stat
.signal_exits
},
69 { "irq_window", &kvm_stat
.irq_window_exits
},
70 { "halt_exits", &kvm_stat
.halt_exits
},
71 { "request_irq", &kvm_stat
.request_irq_exits
},
72 { "irq_exits", &kvm_stat
.irq_exits
},
76 static struct dentry
*debugfs_dir
;
78 #define KVMFS_MAGIC 0x19700426
79 struct vfsmount
*kvmfs_mnt
;
81 #define MAX_IO_MSRS 256
83 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
84 #define LMSW_GUEST_MASK 0x0eULL
85 #define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
86 #define CR8_RESEVED_BITS (~0x0fULL)
87 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
90 // LDT or TSS descriptor in the GDT. 16 bytes.
91 struct segment_descriptor_64
{
92 struct segment_descriptor s
;
99 static struct inode
*kvmfs_inode(struct file_operations
*fops
)
102 struct inode
*inode
= new_inode(kvmfs_mnt
->mnt_sb
);
110 * Mark the inode dirty from the very beginning,
111 * that way it will never be moved to the dirty
112 * list because mark_inode_dirty() will think
113 * that it already _is_ on the dirty list.
115 inode
->i_state
= I_DIRTY
;
116 inode
->i_mode
= S_IRUSR
| S_IWUSR
;
117 inode
->i_uid
= current
->fsuid
;
118 inode
->i_gid
= current
->fsgid
;
119 inode
->i_atime
= inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
123 return ERR_PTR(error
);
126 static struct file
*kvmfs_file(struct inode
*inode
, void *private_data
)
128 struct file
*file
= get_empty_filp();
131 return ERR_PTR(-ENFILE
);
133 file
->f_path
.mnt
= mntget(kvmfs_mnt
);
134 file
->f_path
.dentry
= d_alloc_anon(inode
);
135 if (!file
->f_path
.dentry
)
136 return ERR_PTR(-ENOMEM
);
137 file
->f_mapping
= inode
->i_mapping
;
140 file
->f_flags
= O_RDWR
;
141 file
->f_op
= inode
->i_fop
;
142 file
->f_mode
= FMODE_READ
| FMODE_WRITE
;
144 file
->private_data
= private_data
;
148 unsigned long segment_base(u16 selector
)
150 struct descriptor_table gdt
;
151 struct segment_descriptor
*d
;
152 unsigned long table_base
;
153 typedef unsigned long ul
;
159 asm ("sgdt %0" : "=m"(gdt
));
160 table_base
= gdt
.base
;
162 if (selector
& 4) { /* from ldt */
165 asm ("sldt %0" : "=g"(ldt_selector
));
166 table_base
= segment_base(ldt_selector
);
168 d
= (struct segment_descriptor
*)(table_base
+ (selector
& ~7));
169 v
= d
->base_low
| ((ul
)d
->base_mid
<< 16) | ((ul
)d
->base_high
<< 24);
172 && (d
->type
== 2 || d
->type
== 9 || d
->type
== 11))
173 v
|= ((ul
)((struct segment_descriptor_64
*)d
)->base_higher
) << 32;
177 EXPORT_SYMBOL_GPL(segment_base
);
179 static inline int valid_vcpu(int n
)
181 return likely(n
>= 0 && n
< KVM_MAX_VCPUS
);
184 int kvm_read_guest(struct kvm_vcpu
*vcpu
, gva_t addr
, unsigned long size
,
187 unsigned char *host_buf
= dest
;
188 unsigned long req_size
= size
;
196 paddr
= gva_to_hpa(vcpu
, addr
);
198 if (is_error_hpa(paddr
))
201 guest_buf
= (hva_t
)kmap_atomic(
202 pfn_to_page(paddr
>> PAGE_SHIFT
),
204 offset
= addr
& ~PAGE_MASK
;
206 now
= min(size
, PAGE_SIZE
- offset
);
207 memcpy(host_buf
, (void*)guest_buf
, now
);
211 kunmap_atomic((void *)(guest_buf
& PAGE_MASK
), KM_USER0
);
213 return req_size
- size
;
215 EXPORT_SYMBOL_GPL(kvm_read_guest
);
217 int kvm_write_guest(struct kvm_vcpu
*vcpu
, gva_t addr
, unsigned long size
,
220 unsigned char *host_buf
= data
;
221 unsigned long req_size
= size
;
229 paddr
= gva_to_hpa(vcpu
, addr
);
231 if (is_error_hpa(paddr
))
234 guest_buf
= (hva_t
)kmap_atomic(
235 pfn_to_page(paddr
>> PAGE_SHIFT
), KM_USER0
);
236 offset
= addr
& ~PAGE_MASK
;
238 now
= min(size
, PAGE_SIZE
- offset
);
239 memcpy((void*)guest_buf
, host_buf
, now
);
243 kunmap_atomic((void *)(guest_buf
& PAGE_MASK
), KM_USER0
);
245 return req_size
- size
;
247 EXPORT_SYMBOL_GPL(kvm_write_guest
);
249 static int vcpu_slot(struct kvm_vcpu
*vcpu
)
251 return vcpu
- vcpu
->kvm
->vcpus
;
255 * Switches to specified vcpu, until a matching vcpu_put()
257 static struct kvm_vcpu
*vcpu_load(struct kvm
*kvm
, int vcpu_slot
)
259 struct kvm_vcpu
*vcpu
= &kvm
->vcpus
[vcpu_slot
];
261 mutex_lock(&vcpu
->mutex
);
262 if (unlikely(!vcpu
->vmcs
)) {
263 mutex_unlock(&vcpu
->mutex
);
266 return kvm_arch_ops
->vcpu_load(vcpu
);
269 static void vcpu_put(struct kvm_vcpu
*vcpu
)
271 kvm_arch_ops
->vcpu_put(vcpu
);
272 mutex_unlock(&vcpu
->mutex
);
275 static struct kvm
*kvm_create_vm(void)
277 struct kvm
*kvm
= kzalloc(sizeof(struct kvm
), GFP_KERNEL
);
281 return ERR_PTR(-ENOMEM
);
283 spin_lock_init(&kvm
->lock
);
284 INIT_LIST_HEAD(&kvm
->active_mmu_pages
);
285 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
286 struct kvm_vcpu
*vcpu
= &kvm
->vcpus
[i
];
288 mutex_init(&vcpu
->mutex
);
291 vcpu
->mmu
.root_hpa
= INVALID_PAGE
;
292 INIT_LIST_HEAD(&vcpu
->free_pages
);
293 spin_lock(&kvm_lock
);
294 list_add(&kvm
->vm_list
, &vm_list
);
295 spin_unlock(&kvm_lock
);
300 static int kvm_dev_open(struct inode
*inode
, struct file
*filp
)
306 * Free any memory in @free but not in @dont.
308 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
309 struct kvm_memory_slot
*dont
)
313 if (!dont
|| free
->phys_mem
!= dont
->phys_mem
)
314 if (free
->phys_mem
) {
315 for (i
= 0; i
< free
->npages
; ++i
)
316 if (free
->phys_mem
[i
])
317 __free_page(free
->phys_mem
[i
]);
318 vfree(free
->phys_mem
);
321 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
322 vfree(free
->dirty_bitmap
);
324 free
->phys_mem
= NULL
;
326 free
->dirty_bitmap
= NULL
;
329 static void kvm_free_physmem(struct kvm
*kvm
)
333 for (i
= 0; i
< kvm
->nmemslots
; ++i
)
334 kvm_free_physmem_slot(&kvm
->memslots
[i
], NULL
);
337 static void kvm_free_vcpu(struct kvm_vcpu
*vcpu
)
339 if (!vcpu_load(vcpu
->kvm
, vcpu_slot(vcpu
)))
342 kvm_mmu_destroy(vcpu
);
344 kvm_arch_ops
->vcpu_free(vcpu
);
347 static void kvm_free_vcpus(struct kvm
*kvm
)
351 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
)
352 kvm_free_vcpu(&kvm
->vcpus
[i
]);
355 static int kvm_dev_release(struct inode
*inode
, struct file
*filp
)
360 static void kvm_destroy_vm(struct kvm
*kvm
)
362 spin_lock(&kvm_lock
);
363 list_del(&kvm
->vm_list
);
364 spin_unlock(&kvm_lock
);
366 kvm_free_physmem(kvm
);
370 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
372 struct kvm
*kvm
= filp
->private_data
;
378 static void inject_gp(struct kvm_vcpu
*vcpu
)
380 kvm_arch_ops
->inject_gp(vcpu
, 0);
384 * Load the pae pdptrs. Return true is they are all valid.
386 static int load_pdptrs(struct kvm_vcpu
*vcpu
, unsigned long cr3
)
388 gfn_t pdpt_gfn
= cr3
>> PAGE_SHIFT
;
389 unsigned offset
= ((cr3
& (PAGE_SIZE
-1)) >> 5) << 2;
394 struct kvm_memory_slot
*memslot
;
396 spin_lock(&vcpu
->kvm
->lock
);
397 memslot
= gfn_to_memslot(vcpu
->kvm
, pdpt_gfn
);
398 /* FIXME: !memslot - emulate? 0xff? */
399 pdpt
= kmap_atomic(gfn_to_page(memslot
, pdpt_gfn
), KM_USER0
);
402 for (i
= 0; i
< 4; ++i
) {
403 pdpte
= pdpt
[offset
+ i
];
404 if ((pdpte
& 1) && (pdpte
& 0xfffffff0000001e6ull
)) {
410 for (i
= 0; i
< 4; ++i
)
411 vcpu
->pdptrs
[i
] = pdpt
[offset
+ i
];
414 kunmap_atomic(pdpt
, KM_USER0
);
415 spin_unlock(&vcpu
->kvm
->lock
);
420 void set_cr0(struct kvm_vcpu
*vcpu
, unsigned long cr0
)
422 if (cr0
& CR0_RESEVED_BITS
) {
423 printk(KERN_DEBUG
"set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
429 if ((cr0
& CR0_NW_MASK
) && !(cr0
& CR0_CD_MASK
)) {
430 printk(KERN_DEBUG
"set_cr0: #GP, CD == 0 && NW == 1\n");
435 if ((cr0
& CR0_PG_MASK
) && !(cr0
& CR0_PE_MASK
)) {
436 printk(KERN_DEBUG
"set_cr0: #GP, set PG flag "
437 "and a clear PE flag\n");
442 if (!is_paging(vcpu
) && (cr0
& CR0_PG_MASK
)) {
444 if ((vcpu
->shadow_efer
& EFER_LME
)) {
448 printk(KERN_DEBUG
"set_cr0: #GP, start paging "
449 "in long mode while PAE is disabled\n");
453 kvm_arch_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
455 printk(KERN_DEBUG
"set_cr0: #GP, start paging "
456 "in long mode while CS.L == 1\n");
463 if (is_pae(vcpu
) && !load_pdptrs(vcpu
, vcpu
->cr3
)) {
464 printk(KERN_DEBUG
"set_cr0: #GP, pdptrs "
472 kvm_arch_ops
->set_cr0(vcpu
, cr0
);
475 spin_lock(&vcpu
->kvm
->lock
);
476 kvm_mmu_reset_context(vcpu
);
477 spin_unlock(&vcpu
->kvm
->lock
);
480 EXPORT_SYMBOL_GPL(set_cr0
);
482 void lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
)
484 kvm_arch_ops
->decache_cr0_cr4_guest_bits(vcpu
);
485 set_cr0(vcpu
, (vcpu
->cr0
& ~0x0ful
) | (msw
& 0x0f));
487 EXPORT_SYMBOL_GPL(lmsw
);
489 void set_cr4(struct kvm_vcpu
*vcpu
, unsigned long cr4
)
491 if (cr4
& CR4_RESEVED_BITS
) {
492 printk(KERN_DEBUG
"set_cr4: #GP, reserved bits\n");
497 if (is_long_mode(vcpu
)) {
498 if (!(cr4
& CR4_PAE_MASK
)) {
499 printk(KERN_DEBUG
"set_cr4: #GP, clearing PAE while "
504 } else if (is_paging(vcpu
) && !is_pae(vcpu
) && (cr4
& CR4_PAE_MASK
)
505 && !load_pdptrs(vcpu
, vcpu
->cr3
)) {
506 printk(KERN_DEBUG
"set_cr4: #GP, pdptrs reserved bits\n");
510 if (cr4
& CR4_VMXE_MASK
) {
511 printk(KERN_DEBUG
"set_cr4: #GP, setting VMXE\n");
515 kvm_arch_ops
->set_cr4(vcpu
, cr4
);
516 spin_lock(&vcpu
->kvm
->lock
);
517 kvm_mmu_reset_context(vcpu
);
518 spin_unlock(&vcpu
->kvm
->lock
);
520 EXPORT_SYMBOL_GPL(set_cr4
);
522 void set_cr3(struct kvm_vcpu
*vcpu
, unsigned long cr3
)
524 if (is_long_mode(vcpu
)) {
525 if (cr3
& CR3_L_MODE_RESEVED_BITS
) {
526 printk(KERN_DEBUG
"set_cr3: #GP, reserved bits\n");
531 if (cr3
& CR3_RESEVED_BITS
) {
532 printk(KERN_DEBUG
"set_cr3: #GP, reserved bits\n");
536 if (is_paging(vcpu
) && is_pae(vcpu
) &&
537 !load_pdptrs(vcpu
, cr3
)) {
538 printk(KERN_DEBUG
"set_cr3: #GP, pdptrs "
546 spin_lock(&vcpu
->kvm
->lock
);
548 * Does the new cr3 value map to physical memory? (Note, we
549 * catch an invalid cr3 even in real-mode, because it would
550 * cause trouble later on when we turn on paging anyway.)
552 * A real CPU would silently accept an invalid cr3 and would
553 * attempt to use it - with largely undefined (and often hard
554 * to debug) behavior on the guest side.
556 if (unlikely(!gfn_to_memslot(vcpu
->kvm
, cr3
>> PAGE_SHIFT
)))
559 vcpu
->mmu
.new_cr3(vcpu
);
560 spin_unlock(&vcpu
->kvm
->lock
);
562 EXPORT_SYMBOL_GPL(set_cr3
);
564 void set_cr8(struct kvm_vcpu
*vcpu
, unsigned long cr8
)
566 if ( cr8
& CR8_RESEVED_BITS
) {
567 printk(KERN_DEBUG
"set_cr8: #GP, reserved bits 0x%lx\n", cr8
);
573 EXPORT_SYMBOL_GPL(set_cr8
);
575 void fx_init(struct kvm_vcpu
*vcpu
)
577 struct __attribute__ ((__packed__
)) fx_image_s
{
583 u64 operand
;// fpu dp
589 fx_save(vcpu
->host_fx_image
);
591 fx_save(vcpu
->guest_fx_image
);
592 fx_restore(vcpu
->host_fx_image
);
594 fx_image
= (struct fx_image_s
*)vcpu
->guest_fx_image
;
595 fx_image
->mxcsr
= 0x1f80;
596 memset(vcpu
->guest_fx_image
+ sizeof(struct fx_image_s
),
597 0, FX_IMAGE_SIZE
- sizeof(struct fx_image_s
));
599 EXPORT_SYMBOL_GPL(fx_init
);
602 * Creates some virtual cpus. Good luck creating more than one.
604 static int kvm_dev_ioctl_create_vcpu(struct kvm
*kvm
, int n
)
607 struct kvm_vcpu
*vcpu
;
613 vcpu
= &kvm
->vcpus
[n
];
615 mutex_lock(&vcpu
->mutex
);
618 mutex_unlock(&vcpu
->mutex
);
622 vcpu
->host_fx_image
= (char*)ALIGN((hva_t
)vcpu
->fx_buf
,
624 vcpu
->guest_fx_image
= vcpu
->host_fx_image
+ FX_IMAGE_SIZE
;
626 r
= kvm_arch_ops
->vcpu_create(vcpu
);
630 r
= kvm_mmu_create(vcpu
);
634 kvm_arch_ops
->vcpu_load(vcpu
);
635 r
= kvm_mmu_setup(vcpu
);
637 r
= kvm_arch_ops
->vcpu_setup(vcpu
);
647 mutex_unlock(&vcpu
->mutex
);
653 * Allocate some memory and give it an address in the guest physical address
656 * Discontiguous memory is allowed, mostly for framebuffers.
658 static int kvm_dev_ioctl_set_memory_region(struct kvm
*kvm
,
659 struct kvm_memory_region
*mem
)
663 unsigned long npages
;
665 struct kvm_memory_slot
*memslot
;
666 struct kvm_memory_slot old
, new;
667 int memory_config_version
;
670 /* General sanity checks */
671 if (mem
->memory_size
& (PAGE_SIZE
- 1))
673 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
675 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
677 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
680 memslot
= &kvm
->memslots
[mem
->slot
];
681 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
682 npages
= mem
->memory_size
>> PAGE_SHIFT
;
685 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
688 spin_lock(&kvm
->lock
);
690 memory_config_version
= kvm
->memory_config_version
;
691 new = old
= *memslot
;
693 new.base_gfn
= base_gfn
;
695 new.flags
= mem
->flags
;
697 /* Disallow changing a memory slot's size. */
699 if (npages
&& old
.npages
&& npages
!= old
.npages
)
702 /* Check for overlaps */
704 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
705 struct kvm_memory_slot
*s
= &kvm
->memslots
[i
];
709 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
710 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
714 * Do memory allocations outside lock. memory_config_version will
717 spin_unlock(&kvm
->lock
);
719 /* Deallocate if slot is being removed */
723 /* Free page dirty bitmap if unneeded */
724 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
725 new.dirty_bitmap
= NULL
;
729 /* Allocate if a slot is being created */
730 if (npages
&& !new.phys_mem
) {
731 new.phys_mem
= vmalloc(npages
* sizeof(struct page
*));
736 memset(new.phys_mem
, 0, npages
* sizeof(struct page
*));
737 for (i
= 0; i
< npages
; ++i
) {
738 new.phys_mem
[i
] = alloc_page(GFP_HIGHUSER
740 if (!new.phys_mem
[i
])
742 set_page_private(new.phys_mem
[i
],0);
746 /* Allocate page dirty bitmap if needed */
747 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
748 unsigned dirty_bytes
= ALIGN(npages
, BITS_PER_LONG
) / 8;
750 new.dirty_bitmap
= vmalloc(dirty_bytes
);
751 if (!new.dirty_bitmap
)
753 memset(new.dirty_bitmap
, 0, dirty_bytes
);
756 spin_lock(&kvm
->lock
);
758 if (memory_config_version
!= kvm
->memory_config_version
) {
759 spin_unlock(&kvm
->lock
);
760 kvm_free_physmem_slot(&new, &old
);
768 if (mem
->slot
>= kvm
->nmemslots
)
769 kvm
->nmemslots
= mem
->slot
+ 1;
772 ++kvm
->memory_config_version
;
774 spin_unlock(&kvm
->lock
);
776 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
777 struct kvm_vcpu
*vcpu
;
779 vcpu
= vcpu_load(kvm
, i
);
782 kvm_mmu_reset_context(vcpu
);
786 kvm_free_physmem_slot(&old
, &new);
790 spin_unlock(&kvm
->lock
);
792 kvm_free_physmem_slot(&new, &old
);
797 static void do_remove_write_access(struct kvm_vcpu
*vcpu
, int slot
)
799 spin_lock(&vcpu
->kvm
->lock
);
800 kvm_mmu_slot_remove_write_access(vcpu
, slot
);
801 spin_unlock(&vcpu
->kvm
->lock
);
805 * Get (and clear) the dirty memory log for a memory slot.
807 static int kvm_dev_ioctl_get_dirty_log(struct kvm
*kvm
,
808 struct kvm_dirty_log
*log
)
810 struct kvm_memory_slot
*memslot
;
814 unsigned long any
= 0;
816 spin_lock(&kvm
->lock
);
819 * Prevent changes to guest memory configuration even while the lock
823 spin_unlock(&kvm
->lock
);
825 if (log
->slot
>= KVM_MEMORY_SLOTS
)
828 memslot
= &kvm
->memslots
[log
->slot
];
830 if (!memslot
->dirty_bitmap
)
833 n
= ALIGN(memslot
->npages
, 8) / 8;
835 for (i
= 0; !any
&& i
< n
; ++i
)
836 any
= memslot
->dirty_bitmap
[i
];
839 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
844 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
845 struct kvm_vcpu
*vcpu
= vcpu_load(kvm
, i
);
850 do_remove_write_access(vcpu
, log
->slot
);
851 memset(memslot
->dirty_bitmap
, 0, n
);
854 kvm_arch_ops
->tlb_flush(vcpu
);
862 spin_lock(&kvm
->lock
);
864 spin_unlock(&kvm
->lock
);
868 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
872 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
873 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
875 if (gfn
>= memslot
->base_gfn
876 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
881 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
883 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
886 struct kvm_memory_slot
*memslot
= NULL
;
887 unsigned long rel_gfn
;
889 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
890 memslot
= &kvm
->memslots
[i
];
892 if (gfn
>= memslot
->base_gfn
893 && gfn
< memslot
->base_gfn
+ memslot
->npages
) {
895 if (!memslot
|| !memslot
->dirty_bitmap
)
898 rel_gfn
= gfn
- memslot
->base_gfn
;
901 if (!test_bit(rel_gfn
, memslot
->dirty_bitmap
))
902 set_bit(rel_gfn
, memslot
->dirty_bitmap
);
908 static int emulator_read_std(unsigned long addr
,
911 struct x86_emulate_ctxt
*ctxt
)
913 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
917 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, addr
);
918 unsigned offset
= addr
& (PAGE_SIZE
-1);
919 unsigned tocopy
= min(bytes
, (unsigned)PAGE_SIZE
- offset
);
921 struct kvm_memory_slot
*memslot
;
924 if (gpa
== UNMAPPED_GVA
)
925 return X86EMUL_PROPAGATE_FAULT
;
926 pfn
= gpa
>> PAGE_SHIFT
;
927 memslot
= gfn_to_memslot(vcpu
->kvm
, pfn
);
929 return X86EMUL_UNHANDLEABLE
;
930 page
= kmap_atomic(gfn_to_page(memslot
, pfn
), KM_USER0
);
932 memcpy(data
, page
+ offset
, tocopy
);
934 kunmap_atomic(page
, KM_USER0
);
941 return X86EMUL_CONTINUE
;
944 static int emulator_write_std(unsigned long addr
,
947 struct x86_emulate_ctxt
*ctxt
)
949 printk(KERN_ERR
"emulator_write_std: addr %lx n %d\n",
951 return X86EMUL_UNHANDLEABLE
;
954 static int emulator_read_emulated(unsigned long addr
,
957 struct x86_emulate_ctxt
*ctxt
)
959 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
961 if (vcpu
->mmio_read_completed
) {
962 memcpy(val
, vcpu
->mmio_data
, bytes
);
963 vcpu
->mmio_read_completed
= 0;
964 return X86EMUL_CONTINUE
;
965 } else if (emulator_read_std(addr
, val
, bytes
, ctxt
)
967 return X86EMUL_CONTINUE
;
969 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, addr
);
971 if (gpa
== UNMAPPED_GVA
)
972 return X86EMUL_PROPAGATE_FAULT
;
973 vcpu
->mmio_needed
= 1;
974 vcpu
->mmio_phys_addr
= gpa
;
975 vcpu
->mmio_size
= bytes
;
976 vcpu
->mmio_is_write
= 0;
978 return X86EMUL_UNHANDLEABLE
;
982 static int emulator_write_phys(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
983 unsigned long val
, int bytes
)
985 struct kvm_memory_slot
*m
;
989 if (((gpa
+ bytes
- 1) >> PAGE_SHIFT
) != (gpa
>> PAGE_SHIFT
))
991 m
= gfn_to_memslot(vcpu
->kvm
, gpa
>> PAGE_SHIFT
);
994 page
= gfn_to_page(m
, gpa
>> PAGE_SHIFT
);
995 kvm_mmu_pre_write(vcpu
, gpa
, bytes
);
996 virt
= kmap_atomic(page
, KM_USER0
);
997 memcpy(virt
+ offset_in_page(gpa
), &val
, bytes
);
998 kunmap_atomic(virt
, KM_USER0
);
999 kvm_mmu_post_write(vcpu
, gpa
, bytes
);
1003 static int emulator_write_emulated(unsigned long addr
,
1006 struct x86_emulate_ctxt
*ctxt
)
1008 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
1009 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, addr
);
1011 if (gpa
== UNMAPPED_GVA
)
1012 return X86EMUL_PROPAGATE_FAULT
;
1014 if (emulator_write_phys(vcpu
, gpa
, val
, bytes
))
1015 return X86EMUL_CONTINUE
;
1017 vcpu
->mmio_needed
= 1;
1018 vcpu
->mmio_phys_addr
= gpa
;
1019 vcpu
->mmio_size
= bytes
;
1020 vcpu
->mmio_is_write
= 1;
1021 memcpy(vcpu
->mmio_data
, &val
, bytes
);
1023 return X86EMUL_CONTINUE
;
1026 static int emulator_cmpxchg_emulated(unsigned long addr
,
1030 struct x86_emulate_ctxt
*ctxt
)
1032 static int reported
;
1036 printk(KERN_WARNING
"kvm: emulating exchange as write\n");
1038 return emulator_write_emulated(addr
, new, bytes
, ctxt
);
1041 #ifdef CONFIG_X86_32
1043 static int emulator_cmpxchg8b_emulated(unsigned long addr
,
1044 unsigned long old_lo
,
1045 unsigned long old_hi
,
1046 unsigned long new_lo
,
1047 unsigned long new_hi
,
1048 struct x86_emulate_ctxt
*ctxt
)
1050 static int reported
;
1055 printk(KERN_WARNING
"kvm: emulating exchange8b as write\n");
1057 r
= emulator_write_emulated(addr
, new_lo
, 4, ctxt
);
1058 if (r
!= X86EMUL_CONTINUE
)
1060 return emulator_write_emulated(addr
+4, new_hi
, 4, ctxt
);
1065 static unsigned long get_segment_base(struct kvm_vcpu
*vcpu
, int seg
)
1067 return kvm_arch_ops
->get_segment_base(vcpu
, seg
);
1070 int emulate_invlpg(struct kvm_vcpu
*vcpu
, gva_t address
)
1072 return X86EMUL_CONTINUE
;
1075 int emulate_clts(struct kvm_vcpu
*vcpu
)
1079 kvm_arch_ops
->decache_cr0_cr4_guest_bits(vcpu
);
1080 cr0
= vcpu
->cr0
& ~CR0_TS_MASK
;
1081 kvm_arch_ops
->set_cr0(vcpu
, cr0
);
1082 return X86EMUL_CONTINUE
;
1085 int emulator_get_dr(struct x86_emulate_ctxt
* ctxt
, int dr
, unsigned long *dest
)
1087 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
1091 *dest
= kvm_arch_ops
->get_dr(vcpu
, dr
);
1092 return X86EMUL_CONTINUE
;
1094 printk(KERN_DEBUG
"%s: unexpected dr %u\n",
1096 return X86EMUL_UNHANDLEABLE
;
1100 int emulator_set_dr(struct x86_emulate_ctxt
*ctxt
, int dr
, unsigned long value
)
1102 unsigned long mask
= (ctxt
->mode
== X86EMUL_MODE_PROT64
) ? ~0ULL : ~0U;
1105 kvm_arch_ops
->set_dr(ctxt
->vcpu
, dr
, value
& mask
, &exception
);
1107 /* FIXME: better handling */
1108 return X86EMUL_UNHANDLEABLE
;
1110 return X86EMUL_CONTINUE
;
1113 static void report_emulation_failure(struct x86_emulate_ctxt
*ctxt
)
1115 static int reported
;
1117 unsigned long rip
= ctxt
->vcpu
->rip
;
1118 unsigned long rip_linear
;
1120 rip_linear
= rip
+ get_segment_base(ctxt
->vcpu
, VCPU_SREG_CS
);
1125 emulator_read_std(rip_linear
, (void *)opcodes
, 4, ctxt
);
1127 printk(KERN_ERR
"emulation failed but !mmio_needed?"
1128 " rip %lx %02x %02x %02x %02x\n",
1129 rip
, opcodes
[0], opcodes
[1], opcodes
[2], opcodes
[3]);
1133 struct x86_emulate_ops emulate_ops
= {
1134 .read_std
= emulator_read_std
,
1135 .write_std
= emulator_write_std
,
1136 .read_emulated
= emulator_read_emulated
,
1137 .write_emulated
= emulator_write_emulated
,
1138 .cmpxchg_emulated
= emulator_cmpxchg_emulated
,
1139 #ifdef CONFIG_X86_32
1140 .cmpxchg8b_emulated
= emulator_cmpxchg8b_emulated
,
1144 int emulate_instruction(struct kvm_vcpu
*vcpu
,
1145 struct kvm_run
*run
,
1149 struct x86_emulate_ctxt emulate_ctxt
;
1153 kvm_arch_ops
->cache_regs(vcpu
);
1155 kvm_arch_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
1157 emulate_ctxt
.vcpu
= vcpu
;
1158 emulate_ctxt
.eflags
= kvm_arch_ops
->get_rflags(vcpu
);
1159 emulate_ctxt
.cr2
= cr2
;
1160 emulate_ctxt
.mode
= (emulate_ctxt
.eflags
& X86_EFLAGS_VM
)
1161 ? X86EMUL_MODE_REAL
: cs_l
1162 ? X86EMUL_MODE_PROT64
: cs_db
1163 ? X86EMUL_MODE_PROT32
: X86EMUL_MODE_PROT16
;
1165 if (emulate_ctxt
.mode
== X86EMUL_MODE_PROT64
) {
1166 emulate_ctxt
.cs_base
= 0;
1167 emulate_ctxt
.ds_base
= 0;
1168 emulate_ctxt
.es_base
= 0;
1169 emulate_ctxt
.ss_base
= 0;
1171 emulate_ctxt
.cs_base
= get_segment_base(vcpu
, VCPU_SREG_CS
);
1172 emulate_ctxt
.ds_base
= get_segment_base(vcpu
, VCPU_SREG_DS
);
1173 emulate_ctxt
.es_base
= get_segment_base(vcpu
, VCPU_SREG_ES
);
1174 emulate_ctxt
.ss_base
= get_segment_base(vcpu
, VCPU_SREG_SS
);
1177 emulate_ctxt
.gs_base
= get_segment_base(vcpu
, VCPU_SREG_GS
);
1178 emulate_ctxt
.fs_base
= get_segment_base(vcpu
, VCPU_SREG_FS
);
1180 vcpu
->mmio_is_write
= 0;
1181 r
= x86_emulate_memop(&emulate_ctxt
, &emulate_ops
);
1183 if ((r
|| vcpu
->mmio_is_write
) && run
) {
1184 run
->mmio
.phys_addr
= vcpu
->mmio_phys_addr
;
1185 memcpy(run
->mmio
.data
, vcpu
->mmio_data
, 8);
1186 run
->mmio
.len
= vcpu
->mmio_size
;
1187 run
->mmio
.is_write
= vcpu
->mmio_is_write
;
1191 if (kvm_mmu_unprotect_page_virt(vcpu
, cr2
))
1192 return EMULATE_DONE
;
1193 if (!vcpu
->mmio_needed
) {
1194 report_emulation_failure(&emulate_ctxt
);
1195 return EMULATE_FAIL
;
1197 return EMULATE_DO_MMIO
;
1200 kvm_arch_ops
->decache_regs(vcpu
);
1201 kvm_arch_ops
->set_rflags(vcpu
, emulate_ctxt
.eflags
);
1203 if (vcpu
->mmio_is_write
)
1204 return EMULATE_DO_MMIO
;
1206 return EMULATE_DONE
;
1208 EXPORT_SYMBOL_GPL(emulate_instruction
);
1210 int kvm_hypercall(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
1212 unsigned long nr
, a0
, a1
, a2
, a3
, a4
, a5
, ret
;
1214 kvm_arch_ops
->decache_regs(vcpu
);
1216 #ifdef CONFIG_X86_64
1217 if (is_long_mode(vcpu
)) {
1218 nr
= vcpu
->regs
[VCPU_REGS_RAX
];
1219 a0
= vcpu
->regs
[VCPU_REGS_RDI
];
1220 a1
= vcpu
->regs
[VCPU_REGS_RSI
];
1221 a2
= vcpu
->regs
[VCPU_REGS_RDX
];
1222 a3
= vcpu
->regs
[VCPU_REGS_RCX
];
1223 a4
= vcpu
->regs
[VCPU_REGS_R8
];
1224 a5
= vcpu
->regs
[VCPU_REGS_R9
];
1228 nr
= vcpu
->regs
[VCPU_REGS_RBX
] & -1u;
1229 a0
= vcpu
->regs
[VCPU_REGS_RAX
] & -1u;
1230 a1
= vcpu
->regs
[VCPU_REGS_RCX
] & -1u;
1231 a2
= vcpu
->regs
[VCPU_REGS_RDX
] & -1u;
1232 a3
= vcpu
->regs
[VCPU_REGS_RSI
] & -1u;
1233 a4
= vcpu
->regs
[VCPU_REGS_RDI
] & -1u;
1234 a5
= vcpu
->regs
[VCPU_REGS_RBP
] & -1u;
1240 vcpu
->regs
[VCPU_REGS_RAX
] = ret
;
1241 kvm_arch_ops
->cache_regs(vcpu
);
1244 EXPORT_SYMBOL_GPL(kvm_hypercall
);
1246 static u64
mk_cr_64(u64 curr_cr
, u32 new_val
)
1248 return (curr_cr
& ~((1ULL << 32) - 1)) | new_val
;
1251 void realmode_lgdt(struct kvm_vcpu
*vcpu
, u16 limit
, unsigned long base
)
1253 struct descriptor_table dt
= { limit
, base
};
1255 kvm_arch_ops
->set_gdt(vcpu
, &dt
);
1258 void realmode_lidt(struct kvm_vcpu
*vcpu
, u16 limit
, unsigned long base
)
1260 struct descriptor_table dt
= { limit
, base
};
1262 kvm_arch_ops
->set_idt(vcpu
, &dt
);
1265 void realmode_lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
,
1266 unsigned long *rflags
)
1269 *rflags
= kvm_arch_ops
->get_rflags(vcpu
);
1272 unsigned long realmode_get_cr(struct kvm_vcpu
*vcpu
, int cr
)
1274 kvm_arch_ops
->decache_cr0_cr4_guest_bits(vcpu
);
1285 vcpu_printf(vcpu
, "%s: unexpected cr %u\n", __FUNCTION__
, cr
);
1290 void realmode_set_cr(struct kvm_vcpu
*vcpu
, int cr
, unsigned long val
,
1291 unsigned long *rflags
)
1295 set_cr0(vcpu
, mk_cr_64(vcpu
->cr0
, val
));
1296 *rflags
= kvm_arch_ops
->get_rflags(vcpu
);
1305 set_cr4(vcpu
, mk_cr_64(vcpu
->cr4
, val
));
1308 vcpu_printf(vcpu
, "%s: unexpected cr %u\n", __FUNCTION__
, cr
);
1313 * Register the para guest with the host:
1315 static int vcpu_register_para(struct kvm_vcpu
*vcpu
, gpa_t para_state_gpa
)
1317 struct kvm_vcpu_para_state
*para_state
;
1318 hpa_t para_state_hpa
, hypercall_hpa
;
1319 struct page
*para_state_page
;
1320 unsigned char *hypercall
;
1321 gpa_t hypercall_gpa
;
1323 printk(KERN_DEBUG
"kvm: guest trying to enter paravirtual mode\n");
1324 printk(KERN_DEBUG
".... para_state_gpa: %08Lx\n", para_state_gpa
);
1327 * Needs to be page aligned:
1329 if (para_state_gpa
!= PAGE_ALIGN(para_state_gpa
))
1332 para_state_hpa
= gpa_to_hpa(vcpu
, para_state_gpa
);
1333 printk(KERN_DEBUG
".... para_state_hpa: %08Lx\n", para_state_hpa
);
1334 if (is_error_hpa(para_state_hpa
))
1337 para_state_page
= pfn_to_page(para_state_hpa
>> PAGE_SHIFT
);
1338 para_state
= kmap_atomic(para_state_page
, KM_USER0
);
1340 printk(KERN_DEBUG
".... guest version: %d\n", para_state
->guest_version
);
1341 printk(KERN_DEBUG
".... size: %d\n", para_state
->size
);
1343 para_state
->host_version
= KVM_PARA_API_VERSION
;
1345 * We cannot support guests that try to register themselves
1346 * with a newer API version than the host supports:
1348 if (para_state
->guest_version
> KVM_PARA_API_VERSION
) {
1349 para_state
->ret
= -KVM_EINVAL
;
1350 goto err_kunmap_skip
;
1353 hypercall_gpa
= para_state
->hypercall_gpa
;
1354 hypercall_hpa
= gpa_to_hpa(vcpu
, hypercall_gpa
);
1355 printk(KERN_DEBUG
".... hypercall_hpa: %08Lx\n", hypercall_hpa
);
1356 if (is_error_hpa(hypercall_hpa
)) {
1357 para_state
->ret
= -KVM_EINVAL
;
1358 goto err_kunmap_skip
;
1361 printk(KERN_DEBUG
"kvm: para guest successfully registered.\n");
1362 vcpu
->para_state_page
= para_state_page
;
1363 vcpu
->para_state_gpa
= para_state_gpa
;
1364 vcpu
->hypercall_gpa
= hypercall_gpa
;
1366 hypercall
= kmap_atomic(pfn_to_page(hypercall_hpa
>> PAGE_SHIFT
),
1367 KM_USER1
) + (hypercall_hpa
& ~PAGE_MASK
);
1368 kvm_arch_ops
->patch_hypercall(vcpu
, hypercall
);
1369 kunmap_atomic(hypercall
, KM_USER1
);
1371 para_state
->ret
= 0;
1373 kunmap_atomic(para_state
, KM_USER0
);
1379 int kvm_get_msr_common(struct kvm_vcpu
*vcpu
, u32 msr
, u64
*pdata
)
1384 case 0xc0010010: /* SYSCFG */
1385 case 0xc0010015: /* HWCR */
1386 case MSR_IA32_PLATFORM_ID
:
1387 case MSR_IA32_P5_MC_ADDR
:
1388 case MSR_IA32_P5_MC_TYPE
:
1389 case MSR_IA32_MC0_CTL
:
1390 case MSR_IA32_MCG_STATUS
:
1391 case MSR_IA32_MCG_CAP
:
1392 case MSR_IA32_MC0_MISC
:
1393 case MSR_IA32_MC0_MISC
+4:
1394 case MSR_IA32_MC0_MISC
+8:
1395 case MSR_IA32_MC0_MISC
+12:
1396 case MSR_IA32_MC0_MISC
+16:
1397 case MSR_IA32_UCODE_REV
:
1398 case MSR_IA32_PERF_STATUS
:
1399 /* MTRR registers */
1401 case 0x200 ... 0x2ff:
1404 case 0xcd: /* fsb frequency */
1407 case MSR_IA32_APICBASE
:
1408 data
= vcpu
->apic_base
;
1410 case MSR_IA32_MISC_ENABLE
:
1411 data
= vcpu
->ia32_misc_enable_msr
;
1413 #ifdef CONFIG_X86_64
1415 data
= vcpu
->shadow_efer
;
1419 printk(KERN_ERR
"kvm: unhandled rdmsr: 0x%x\n", msr
);
1425 EXPORT_SYMBOL_GPL(kvm_get_msr_common
);
1428 * Reads an msr value (of 'msr_index') into 'pdata'.
1429 * Returns 0 on success, non-0 otherwise.
1430 * Assumes vcpu_load() was already called.
1432 static int get_msr(struct kvm_vcpu
*vcpu
, u32 msr_index
, u64
*pdata
)
1434 return kvm_arch_ops
->get_msr(vcpu
, msr_index
, pdata
);
1437 #ifdef CONFIG_X86_64
1439 static void set_efer(struct kvm_vcpu
*vcpu
, u64 efer
)
1441 if (efer
& EFER_RESERVED_BITS
) {
1442 printk(KERN_DEBUG
"set_efer: 0x%llx #GP, reserved bits\n",
1449 && (vcpu
->shadow_efer
& EFER_LME
) != (efer
& EFER_LME
)) {
1450 printk(KERN_DEBUG
"set_efer: #GP, change LME while paging\n");
1455 kvm_arch_ops
->set_efer(vcpu
, efer
);
1458 efer
|= vcpu
->shadow_efer
& EFER_LMA
;
1460 vcpu
->shadow_efer
= efer
;
1465 int kvm_set_msr_common(struct kvm_vcpu
*vcpu
, u32 msr
, u64 data
)
1468 #ifdef CONFIG_X86_64
1470 set_efer(vcpu
, data
);
1473 case MSR_IA32_MC0_STATUS
:
1474 printk(KERN_WARNING
"%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1475 __FUNCTION__
, data
);
1477 case MSR_IA32_UCODE_REV
:
1478 case MSR_IA32_UCODE_WRITE
:
1479 case 0x200 ... 0x2ff: /* MTRRs */
1481 case MSR_IA32_APICBASE
:
1482 vcpu
->apic_base
= data
;
1484 case MSR_IA32_MISC_ENABLE
:
1485 vcpu
->ia32_misc_enable_msr
= data
;
1488 * This is the 'probe whether the host is KVM' logic:
1490 case MSR_KVM_API_MAGIC
:
1491 return vcpu_register_para(vcpu
, data
);
1494 printk(KERN_ERR
"kvm: unhandled wrmsr: 0x%x\n", msr
);
1499 EXPORT_SYMBOL_GPL(kvm_set_msr_common
);
1502 * Writes msr value into into the appropriate "register".
1503 * Returns 0 on success, non-0 otherwise.
1504 * Assumes vcpu_load() was already called.
1506 static int set_msr(struct kvm_vcpu
*vcpu
, u32 msr_index
, u64 data
)
1508 return kvm_arch_ops
->set_msr(vcpu
, msr_index
, data
);
1511 void kvm_resched(struct kvm_vcpu
*vcpu
)
1515 /* Cannot fail - no vcpu unplug yet. */
1516 vcpu_load(vcpu
->kvm
, vcpu_slot(vcpu
));
1518 EXPORT_SYMBOL_GPL(kvm_resched
);
1520 void load_msrs(struct vmx_msr_entry
*e
, int n
)
1524 for (i
= 0; i
< n
; ++i
)
1525 wrmsrl(e
[i
].index
, e
[i
].data
);
1527 EXPORT_SYMBOL_GPL(load_msrs
);
1529 void save_msrs(struct vmx_msr_entry
*e
, int n
)
1533 for (i
= 0; i
< n
; ++i
)
1534 rdmsrl(e
[i
].index
, e
[i
].data
);
1536 EXPORT_SYMBOL_GPL(save_msrs
);
1538 static int kvm_dev_ioctl_run(struct kvm
*kvm
, struct kvm_run
*kvm_run
)
1540 struct kvm_vcpu
*vcpu
;
1543 if (!valid_vcpu(kvm_run
->vcpu
))
1546 vcpu
= vcpu_load(kvm
, kvm_run
->vcpu
);
1550 /* re-sync apic's tpr */
1551 vcpu
->cr8
= kvm_run
->cr8
;
1553 if (kvm_run
->emulated
) {
1554 kvm_arch_ops
->skip_emulated_instruction(vcpu
);
1555 kvm_run
->emulated
= 0;
1558 if (kvm_run
->mmio_completed
) {
1559 memcpy(vcpu
->mmio_data
, kvm_run
->mmio
.data
, 8);
1560 vcpu
->mmio_read_completed
= 1;
1563 vcpu
->mmio_needed
= 0;
1565 r
= kvm_arch_ops
->run(vcpu
, kvm_run
);
1571 static int kvm_dev_ioctl_get_regs(struct kvm
*kvm
, struct kvm_regs
*regs
)
1573 struct kvm_vcpu
*vcpu
;
1575 if (!valid_vcpu(regs
->vcpu
))
1578 vcpu
= vcpu_load(kvm
, regs
->vcpu
);
1582 kvm_arch_ops
->cache_regs(vcpu
);
1584 regs
->rax
= vcpu
->regs
[VCPU_REGS_RAX
];
1585 regs
->rbx
= vcpu
->regs
[VCPU_REGS_RBX
];
1586 regs
->rcx
= vcpu
->regs
[VCPU_REGS_RCX
];
1587 regs
->rdx
= vcpu
->regs
[VCPU_REGS_RDX
];
1588 regs
->rsi
= vcpu
->regs
[VCPU_REGS_RSI
];
1589 regs
->rdi
= vcpu
->regs
[VCPU_REGS_RDI
];
1590 regs
->rsp
= vcpu
->regs
[VCPU_REGS_RSP
];
1591 regs
->rbp
= vcpu
->regs
[VCPU_REGS_RBP
];
1592 #ifdef CONFIG_X86_64
1593 regs
->r8
= vcpu
->regs
[VCPU_REGS_R8
];
1594 regs
->r9
= vcpu
->regs
[VCPU_REGS_R9
];
1595 regs
->r10
= vcpu
->regs
[VCPU_REGS_R10
];
1596 regs
->r11
= vcpu
->regs
[VCPU_REGS_R11
];
1597 regs
->r12
= vcpu
->regs
[VCPU_REGS_R12
];
1598 regs
->r13
= vcpu
->regs
[VCPU_REGS_R13
];
1599 regs
->r14
= vcpu
->regs
[VCPU_REGS_R14
];
1600 regs
->r15
= vcpu
->regs
[VCPU_REGS_R15
];
1603 regs
->rip
= vcpu
->rip
;
1604 regs
->rflags
= kvm_arch_ops
->get_rflags(vcpu
);
1607 * Don't leak debug flags in case they were set for guest debugging
1609 if (vcpu
->guest_debug
.enabled
&& vcpu
->guest_debug
.singlestep
)
1610 regs
->rflags
&= ~(X86_EFLAGS_TF
| X86_EFLAGS_RF
);
1617 static int kvm_dev_ioctl_set_regs(struct kvm
*kvm
, struct kvm_regs
*regs
)
1619 struct kvm_vcpu
*vcpu
;
1621 if (!valid_vcpu(regs
->vcpu
))
1624 vcpu
= vcpu_load(kvm
, regs
->vcpu
);
1628 vcpu
->regs
[VCPU_REGS_RAX
] = regs
->rax
;
1629 vcpu
->regs
[VCPU_REGS_RBX
] = regs
->rbx
;
1630 vcpu
->regs
[VCPU_REGS_RCX
] = regs
->rcx
;
1631 vcpu
->regs
[VCPU_REGS_RDX
] = regs
->rdx
;
1632 vcpu
->regs
[VCPU_REGS_RSI
] = regs
->rsi
;
1633 vcpu
->regs
[VCPU_REGS_RDI
] = regs
->rdi
;
1634 vcpu
->regs
[VCPU_REGS_RSP
] = regs
->rsp
;
1635 vcpu
->regs
[VCPU_REGS_RBP
] = regs
->rbp
;
1636 #ifdef CONFIG_X86_64
1637 vcpu
->regs
[VCPU_REGS_R8
] = regs
->r8
;
1638 vcpu
->regs
[VCPU_REGS_R9
] = regs
->r9
;
1639 vcpu
->regs
[VCPU_REGS_R10
] = regs
->r10
;
1640 vcpu
->regs
[VCPU_REGS_R11
] = regs
->r11
;
1641 vcpu
->regs
[VCPU_REGS_R12
] = regs
->r12
;
1642 vcpu
->regs
[VCPU_REGS_R13
] = regs
->r13
;
1643 vcpu
->regs
[VCPU_REGS_R14
] = regs
->r14
;
1644 vcpu
->regs
[VCPU_REGS_R15
] = regs
->r15
;
1647 vcpu
->rip
= regs
->rip
;
1648 kvm_arch_ops
->set_rflags(vcpu
, regs
->rflags
);
1650 kvm_arch_ops
->decache_regs(vcpu
);
1657 static void get_segment(struct kvm_vcpu
*vcpu
,
1658 struct kvm_segment
*var
, int seg
)
1660 return kvm_arch_ops
->get_segment(vcpu
, var
, seg
);
1663 static int kvm_dev_ioctl_get_sregs(struct kvm
*kvm
, struct kvm_sregs
*sregs
)
1665 struct kvm_vcpu
*vcpu
;
1666 struct descriptor_table dt
;
1668 if (!valid_vcpu(sregs
->vcpu
))
1670 vcpu
= vcpu_load(kvm
, sregs
->vcpu
);
1674 get_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
1675 get_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
1676 get_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
1677 get_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
1678 get_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
1679 get_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
1681 get_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
1682 get_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
1684 kvm_arch_ops
->get_idt(vcpu
, &dt
);
1685 sregs
->idt
.limit
= dt
.limit
;
1686 sregs
->idt
.base
= dt
.base
;
1687 kvm_arch_ops
->get_gdt(vcpu
, &dt
);
1688 sregs
->gdt
.limit
= dt
.limit
;
1689 sregs
->gdt
.base
= dt
.base
;
1691 kvm_arch_ops
->decache_cr0_cr4_guest_bits(vcpu
);
1692 sregs
->cr0
= vcpu
->cr0
;
1693 sregs
->cr2
= vcpu
->cr2
;
1694 sregs
->cr3
= vcpu
->cr3
;
1695 sregs
->cr4
= vcpu
->cr4
;
1696 sregs
->cr8
= vcpu
->cr8
;
1697 sregs
->efer
= vcpu
->shadow_efer
;
1698 sregs
->apic_base
= vcpu
->apic_base
;
1700 memcpy(sregs
->interrupt_bitmap
, vcpu
->irq_pending
,
1701 sizeof sregs
->interrupt_bitmap
);
1708 static void set_segment(struct kvm_vcpu
*vcpu
,
1709 struct kvm_segment
*var
, int seg
)
1711 return kvm_arch_ops
->set_segment(vcpu
, var
, seg
);
1714 static int kvm_dev_ioctl_set_sregs(struct kvm
*kvm
, struct kvm_sregs
*sregs
)
1716 struct kvm_vcpu
*vcpu
;
1717 int mmu_reset_needed
= 0;
1719 struct descriptor_table dt
;
1721 if (!valid_vcpu(sregs
->vcpu
))
1723 vcpu
= vcpu_load(kvm
, sregs
->vcpu
);
1727 set_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
1728 set_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
1729 set_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
1730 set_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
1731 set_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
1732 set_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
1734 set_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
1735 set_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
1737 dt
.limit
= sregs
->idt
.limit
;
1738 dt
.base
= sregs
->idt
.base
;
1739 kvm_arch_ops
->set_idt(vcpu
, &dt
);
1740 dt
.limit
= sregs
->gdt
.limit
;
1741 dt
.base
= sregs
->gdt
.base
;
1742 kvm_arch_ops
->set_gdt(vcpu
, &dt
);
1744 vcpu
->cr2
= sregs
->cr2
;
1745 mmu_reset_needed
|= vcpu
->cr3
!= sregs
->cr3
;
1746 vcpu
->cr3
= sregs
->cr3
;
1748 vcpu
->cr8
= sregs
->cr8
;
1750 mmu_reset_needed
|= vcpu
->shadow_efer
!= sregs
->efer
;
1751 #ifdef CONFIG_X86_64
1752 kvm_arch_ops
->set_efer(vcpu
, sregs
->efer
);
1754 vcpu
->apic_base
= sregs
->apic_base
;
1756 kvm_arch_ops
->decache_cr0_cr4_guest_bits(vcpu
);
1758 mmu_reset_needed
|= vcpu
->cr0
!= sregs
->cr0
;
1759 kvm_arch_ops
->set_cr0_no_modeswitch(vcpu
, sregs
->cr0
);
1761 mmu_reset_needed
|= vcpu
->cr4
!= sregs
->cr4
;
1762 kvm_arch_ops
->set_cr4(vcpu
, sregs
->cr4
);
1763 if (!is_long_mode(vcpu
) && is_pae(vcpu
))
1764 load_pdptrs(vcpu
, vcpu
->cr3
);
1766 if (mmu_reset_needed
)
1767 kvm_mmu_reset_context(vcpu
);
1769 memcpy(vcpu
->irq_pending
, sregs
->interrupt_bitmap
,
1770 sizeof vcpu
->irq_pending
);
1771 vcpu
->irq_summary
= 0;
1772 for (i
= 0; i
< NR_IRQ_WORDS
; ++i
)
1773 if (vcpu
->irq_pending
[i
])
1774 __set_bit(i
, &vcpu
->irq_summary
);
1782 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1783 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1785 * This list is modified at module load time to reflect the
1786 * capabilities of the host cpu.
1788 static u32 msrs_to_save
[] = {
1789 MSR_IA32_SYSENTER_CS
, MSR_IA32_SYSENTER_ESP
, MSR_IA32_SYSENTER_EIP
,
1791 #ifdef CONFIG_X86_64
1792 MSR_CSTAR
, MSR_KERNEL_GS_BASE
, MSR_SYSCALL_MASK
, MSR_LSTAR
,
1794 MSR_IA32_TIME_STAMP_COUNTER
,
1797 static unsigned num_msrs_to_save
;
1799 static u32 emulated_msrs
[] = {
1800 MSR_IA32_MISC_ENABLE
,
1803 static __init
void kvm_init_msr_list(void)
1808 for (i
= j
= 0; i
< ARRAY_SIZE(msrs_to_save
); i
++) {
1809 if (rdmsr_safe(msrs_to_save
[i
], &dummy
[0], &dummy
[1]) < 0)
1812 msrs_to_save
[j
] = msrs_to_save
[i
];
1815 num_msrs_to_save
= j
;
1819 * Adapt set_msr() to msr_io()'s calling convention
1821 static int do_set_msr(struct kvm_vcpu
*vcpu
, unsigned index
, u64
*data
)
1823 return set_msr(vcpu
, index
, *data
);
1827 * Read or write a bunch of msrs. All parameters are kernel addresses.
1829 * @return number of msrs set successfully.
1831 static int __msr_io(struct kvm
*kvm
, struct kvm_msrs
*msrs
,
1832 struct kvm_msr_entry
*entries
,
1833 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
1834 unsigned index
, u64
*data
))
1836 struct kvm_vcpu
*vcpu
;
1839 if (!valid_vcpu(msrs
->vcpu
))
1842 vcpu
= vcpu_load(kvm
, msrs
->vcpu
);
1846 for (i
= 0; i
< msrs
->nmsrs
; ++i
)
1847 if (do_msr(vcpu
, entries
[i
].index
, &entries
[i
].data
))
1856 * Read or write a bunch of msrs. Parameters are user addresses.
1858 * @return number of msrs set successfully.
1860 static int msr_io(struct kvm
*kvm
, struct kvm_msrs __user
*user_msrs
,
1861 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
1862 unsigned index
, u64
*data
),
1865 struct kvm_msrs msrs
;
1866 struct kvm_msr_entry
*entries
;
1871 if (copy_from_user(&msrs
, user_msrs
, sizeof msrs
))
1875 if (msrs
.nmsrs
>= MAX_IO_MSRS
)
1879 size
= sizeof(struct kvm_msr_entry
) * msrs
.nmsrs
;
1880 entries
= vmalloc(size
);
1885 if (copy_from_user(entries
, user_msrs
->entries
, size
))
1888 r
= n
= __msr_io(kvm
, &msrs
, entries
, do_msr
);
1893 if (writeback
&& copy_to_user(user_msrs
->entries
, entries
, size
))
1905 * Translate a guest virtual address to a guest physical address.
1907 static int kvm_dev_ioctl_translate(struct kvm
*kvm
, struct kvm_translation
*tr
)
1909 unsigned long vaddr
= tr
->linear_address
;
1910 struct kvm_vcpu
*vcpu
;
1913 vcpu
= vcpu_load(kvm
, tr
->vcpu
);
1916 spin_lock(&kvm
->lock
);
1917 gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, vaddr
);
1918 tr
->physical_address
= gpa
;
1919 tr
->valid
= gpa
!= UNMAPPED_GVA
;
1922 spin_unlock(&kvm
->lock
);
1928 static int kvm_dev_ioctl_interrupt(struct kvm
*kvm
, struct kvm_interrupt
*irq
)
1930 struct kvm_vcpu
*vcpu
;
1932 if (!valid_vcpu(irq
->vcpu
))
1934 if (irq
->irq
< 0 || irq
->irq
>= 256)
1936 vcpu
= vcpu_load(kvm
, irq
->vcpu
);
1940 set_bit(irq
->irq
, vcpu
->irq_pending
);
1941 set_bit(irq
->irq
/ BITS_PER_LONG
, &vcpu
->irq_summary
);
1948 static int kvm_dev_ioctl_debug_guest(struct kvm
*kvm
,
1949 struct kvm_debug_guest
*dbg
)
1951 struct kvm_vcpu
*vcpu
;
1954 if (!valid_vcpu(dbg
->vcpu
))
1956 vcpu
= vcpu_load(kvm
, dbg
->vcpu
);
1960 r
= kvm_arch_ops
->set_guest_debug(vcpu
, dbg
);
1967 static long kvm_vm_ioctl(struct file
*filp
,
1968 unsigned int ioctl
, unsigned long arg
)
1970 struct kvm
*kvm
= filp
->private_data
;
1971 void __user
*argp
= (void __user
*)arg
;
1975 case KVM_CREATE_VCPU
:
1976 r
= kvm_dev_ioctl_create_vcpu(kvm
, arg
);
1981 struct kvm_run kvm_run
;
1984 if (copy_from_user(&kvm_run
, argp
, sizeof kvm_run
))
1986 r
= kvm_dev_ioctl_run(kvm
, &kvm_run
);
1987 if (r
< 0 && r
!= -EINTR
)
1989 if (copy_to_user(argp
, &kvm_run
, sizeof kvm_run
)) {
1995 case KVM_GET_REGS
: {
1996 struct kvm_regs kvm_regs
;
1999 if (copy_from_user(&kvm_regs
, argp
, sizeof kvm_regs
))
2001 r
= kvm_dev_ioctl_get_regs(kvm
, &kvm_regs
);
2005 if (copy_to_user(argp
, &kvm_regs
, sizeof kvm_regs
))
2010 case KVM_SET_REGS
: {
2011 struct kvm_regs kvm_regs
;
2014 if (copy_from_user(&kvm_regs
, argp
, sizeof kvm_regs
))
2016 r
= kvm_dev_ioctl_set_regs(kvm
, &kvm_regs
);
2022 case KVM_GET_SREGS
: {
2023 struct kvm_sregs kvm_sregs
;
2026 if (copy_from_user(&kvm_sregs
, argp
, sizeof kvm_sregs
))
2028 r
= kvm_dev_ioctl_get_sregs(kvm
, &kvm_sregs
);
2032 if (copy_to_user(argp
, &kvm_sregs
, sizeof kvm_sregs
))
2037 case KVM_SET_SREGS
: {
2038 struct kvm_sregs kvm_sregs
;
2041 if (copy_from_user(&kvm_sregs
, argp
, sizeof kvm_sregs
))
2043 r
= kvm_dev_ioctl_set_sregs(kvm
, &kvm_sregs
);
2049 case KVM_TRANSLATE
: {
2050 struct kvm_translation tr
;
2053 if (copy_from_user(&tr
, argp
, sizeof tr
))
2055 r
= kvm_dev_ioctl_translate(kvm
, &tr
);
2059 if (copy_to_user(argp
, &tr
, sizeof tr
))
2064 case KVM_INTERRUPT
: {
2065 struct kvm_interrupt irq
;
2068 if (copy_from_user(&irq
, argp
, sizeof irq
))
2070 r
= kvm_dev_ioctl_interrupt(kvm
, &irq
);
2076 case KVM_DEBUG_GUEST
: {
2077 struct kvm_debug_guest dbg
;
2080 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2082 r
= kvm_dev_ioctl_debug_guest(kvm
, &dbg
);
2088 case KVM_SET_MEMORY_REGION
: {
2089 struct kvm_memory_region kvm_mem
;
2092 if (copy_from_user(&kvm_mem
, argp
, sizeof kvm_mem
))
2094 r
= kvm_dev_ioctl_set_memory_region(kvm
, &kvm_mem
);
2099 case KVM_GET_DIRTY_LOG
: {
2100 struct kvm_dirty_log log
;
2103 if (copy_from_user(&log
, argp
, sizeof log
))
2105 r
= kvm_dev_ioctl_get_dirty_log(kvm
, &log
);
2111 r
= msr_io(kvm
, argp
, get_msr
, 1);
2114 r
= msr_io(kvm
, argp
, do_set_msr
, 0);
2123 static struct page
*kvm_vm_nopage(struct vm_area_struct
*vma
,
2124 unsigned long address
,
2127 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2128 unsigned long pgoff
;
2129 struct kvm_memory_slot
*slot
;
2132 *type
= VM_FAULT_MINOR
;
2133 pgoff
= ((address
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
2134 slot
= gfn_to_memslot(kvm
, pgoff
);
2136 return NOPAGE_SIGBUS
;
2137 page
= gfn_to_page(slot
, pgoff
);
2139 return NOPAGE_SIGBUS
;
2144 static struct vm_operations_struct kvm_vm_vm_ops
= {
2145 .nopage
= kvm_vm_nopage
,
2148 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2150 vma
->vm_ops
= &kvm_vm_vm_ops
;
2154 static struct file_operations kvm_vm_fops
= {
2155 .release
= kvm_vm_release
,
2156 .unlocked_ioctl
= kvm_vm_ioctl
,
2157 .compat_ioctl
= kvm_vm_ioctl
,
2158 .mmap
= kvm_vm_mmap
,
2161 static int kvm_dev_ioctl_create_vm(void)
2164 struct inode
*inode
;
2168 inode
= kvmfs_inode(&kvm_vm_fops
);
2169 if (IS_ERR(inode
)) {
2174 kvm
= kvm_create_vm();
2180 file
= kvmfs_file(inode
, kvm
);
2186 r
= get_unused_fd();
2190 fd_install(fd
, file
);
2197 kvm_destroy_vm(kvm
);
2204 static long kvm_dev_ioctl(struct file
*filp
,
2205 unsigned int ioctl
, unsigned long arg
)
2207 void __user
*argp
= (void __user
*)arg
;
2211 case KVM_GET_API_VERSION
:
2212 r
= KVM_API_VERSION
;
2215 r
= kvm_dev_ioctl_create_vm();
2217 case KVM_GET_MSR_INDEX_LIST
: {
2218 struct kvm_msr_list __user
*user_msr_list
= argp
;
2219 struct kvm_msr_list msr_list
;
2223 if (copy_from_user(&msr_list
, user_msr_list
, sizeof msr_list
))
2226 msr_list
.nmsrs
= num_msrs_to_save
+ ARRAY_SIZE(emulated_msrs
);
2227 if (copy_to_user(user_msr_list
, &msr_list
, sizeof msr_list
))
2230 if (n
< num_msrs_to_save
)
2233 if (copy_to_user(user_msr_list
->indices
, &msrs_to_save
,
2234 num_msrs_to_save
* sizeof(u32
)))
2236 if (copy_to_user(user_msr_list
->indices
2237 + num_msrs_to_save
* sizeof(u32
),
2239 ARRAY_SIZE(emulated_msrs
) * sizeof(u32
)))
2251 static struct file_operations kvm_chardev_ops
= {
2252 .open
= kvm_dev_open
,
2253 .release
= kvm_dev_release
,
2254 .unlocked_ioctl
= kvm_dev_ioctl
,
2255 .compat_ioctl
= kvm_dev_ioctl
,
2258 static struct miscdevice kvm_dev
= {
2264 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2267 if (val
== SYS_RESTART
) {
2269 * Some (well, at least mine) BIOSes hang on reboot if
2272 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2273 on_each_cpu(kvm_arch_ops
->hardware_disable
, NULL
, 0, 1);
2278 static struct notifier_block kvm_reboot_notifier
= {
2279 .notifier_call
= kvm_reboot
,
2284 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2287 static void decache_vcpus_on_cpu(int cpu
)
2290 struct kvm_vcpu
*vcpu
;
2293 spin_lock(&kvm_lock
);
2294 list_for_each_entry(vm
, &vm_list
, vm_list
)
2295 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
2296 vcpu
= &vm
->vcpus
[i
];
2298 * If the vcpu is locked, then it is running on some
2299 * other cpu and therefore it is not cached on the
2302 * If it's not locked, check the last cpu it executed
2305 if (mutex_trylock(&vcpu
->mutex
)) {
2306 if (vcpu
->cpu
== cpu
) {
2307 kvm_arch_ops
->vcpu_decache(vcpu
);
2310 mutex_unlock(&vcpu
->mutex
);
2313 spin_unlock(&kvm_lock
);
2316 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2322 case CPU_DOWN_PREPARE
:
2323 case CPU_UP_CANCELED
:
2324 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2326 decache_vcpus_on_cpu(cpu
);
2327 smp_call_function_single(cpu
, kvm_arch_ops
->hardware_disable
,
2331 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2333 smp_call_function_single(cpu
, kvm_arch_ops
->hardware_enable
,
2340 static struct notifier_block kvm_cpu_notifier
= {
2341 .notifier_call
= kvm_cpu_hotplug
,
2342 .priority
= 20, /* must be > scheduler priority */
2345 static __init
void kvm_init_debug(void)
2347 struct kvm_stats_debugfs_item
*p
;
2349 debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2350 for (p
= debugfs_entries
; p
->name
; ++p
)
2351 p
->dentry
= debugfs_create_u32(p
->name
, 0444, debugfs_dir
,
2355 static void kvm_exit_debug(void)
2357 struct kvm_stats_debugfs_item
*p
;
2359 for (p
= debugfs_entries
; p
->name
; ++p
)
2360 debugfs_remove(p
->dentry
);
2361 debugfs_remove(debugfs_dir
);
2364 static int kvm_suspend(struct sys_device
*dev
, pm_message_t state
)
2366 decache_vcpus_on_cpu(raw_smp_processor_id());
2367 on_each_cpu(kvm_arch_ops
->hardware_disable
, NULL
, 0, 1);
2371 static int kvm_resume(struct sys_device
*dev
)
2373 on_each_cpu(kvm_arch_ops
->hardware_enable
, NULL
, 0, 1);
2377 static struct sysdev_class kvm_sysdev_class
= {
2378 set_kset_name("kvm"),
2379 .suspend
= kvm_suspend
,
2380 .resume
= kvm_resume
,
2383 static struct sys_device kvm_sysdev
= {
2385 .cls
= &kvm_sysdev_class
,
2388 hpa_t bad_page_address
;
2390 static int kvmfs_get_sb(struct file_system_type
*fs_type
, int flags
,
2391 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
2393 return get_sb_pseudo(fs_type
, "kvm:", NULL
, KVMFS_MAGIC
, mnt
);
2396 static struct file_system_type kvm_fs_type
= {
2398 .get_sb
= kvmfs_get_sb
,
2399 .kill_sb
= kill_anon_super
,
2402 int kvm_init_arch(struct kvm_arch_ops
*ops
, struct module
*module
)
2407 printk(KERN_ERR
"kvm: already loaded the other module\n");
2411 if (!ops
->cpu_has_kvm_support()) {
2412 printk(KERN_ERR
"kvm: no hardware support\n");
2415 if (ops
->disabled_by_bios()) {
2416 printk(KERN_ERR
"kvm: disabled by bios\n");
2422 r
= kvm_arch_ops
->hardware_setup();
2426 on_each_cpu(kvm_arch_ops
->hardware_enable
, NULL
, 0, 1);
2427 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2430 register_reboot_notifier(&kvm_reboot_notifier
);
2432 r
= sysdev_class_register(&kvm_sysdev_class
);
2436 r
= sysdev_register(&kvm_sysdev
);
2440 kvm_chardev_ops
.owner
= module
;
2442 r
= misc_register(&kvm_dev
);
2444 printk (KERN_ERR
"kvm: misc device register failed\n");
2451 sysdev_unregister(&kvm_sysdev
);
2453 sysdev_class_unregister(&kvm_sysdev_class
);
2455 unregister_reboot_notifier(&kvm_reboot_notifier
);
2456 unregister_cpu_notifier(&kvm_cpu_notifier
);
2458 on_each_cpu(kvm_arch_ops
->hardware_disable
, NULL
, 0, 1);
2459 kvm_arch_ops
->hardware_unsetup();
2463 void kvm_exit_arch(void)
2465 misc_deregister(&kvm_dev
);
2466 sysdev_unregister(&kvm_sysdev
);
2467 sysdev_class_unregister(&kvm_sysdev_class
);
2468 unregister_reboot_notifier(&kvm_reboot_notifier
);
2469 unregister_cpu_notifier(&kvm_cpu_notifier
);
2470 on_each_cpu(kvm_arch_ops
->hardware_disable
, NULL
, 0, 1);
2471 kvm_arch_ops
->hardware_unsetup();
2472 kvm_arch_ops
= NULL
;
2475 static __init
int kvm_init(void)
2477 static struct page
*bad_page
;
2480 r
= register_filesystem(&kvm_fs_type
);
2484 kvmfs_mnt
= kern_mount(&kvm_fs_type
);
2485 r
= PTR_ERR(kvmfs_mnt
);
2486 if (IS_ERR(kvmfs_mnt
))
2490 kvm_init_msr_list();
2492 if ((bad_page
= alloc_page(GFP_KERNEL
)) == NULL
) {
2497 bad_page_address
= page_to_pfn(bad_page
) << PAGE_SHIFT
;
2498 memset(__va(bad_page_address
), 0, PAGE_SIZE
);
2506 unregister_filesystem(&kvm_fs_type
);
2511 static __exit
void kvm_exit(void)
2514 __free_page(pfn_to_page(bad_page_address
>> PAGE_SHIFT
));
2516 unregister_filesystem(&kvm_fs_type
);
2519 module_init(kvm_init
)
2520 module_exit(kvm_exit
)
2522 EXPORT_SYMBOL_GPL(kvm_init_arch
);
2523 EXPORT_SYMBOL_GPL(kvm_exit_arch
);